It's good for consistency and makes the examples easier to read.
an additional connection.
-$ pg_recvlogical -d postgres --slot test --create-slot
-$ pg_recvlogical -d postgres --slot test --start -f -
+$ pg_recvlogical -d postgres --slot=test --create-slot
+$ pg_recvlogical -d postgres --slot=test --start -f -
ControlZ
$ psql -d postgres -c "INSERT INTO data(data) VALUES('4');"
$ fg
table public.data: INSERT: id[integer]:4 data[text]:'4'
COMMIT 693
ControlC
-$ pg_recvlogical -d postgres --slot test --drop-slot
+$ pg_recvlogical -d postgres --slot=test --drop-slot